Add VxWorks fixincludes hack, open posix API for C++

When system headers expose a strict "open" prototype with
3 args, arrange to expose a C++ overload with only two.

2021-01-10  Olivier Hainque  <hainque@adacore.com>

	* inclhack.def (vxworks_math_h_fp_c99): New hack.
	* tests/base/fcntl.h: Update.
	* fixincl.x: Regenerate.

fixincludes/fixincl.x

@@ -2,11 +2,11 @@
  *
  * DO NOT EDIT THIS FILE   (fixincl.x)
  *
- * It has been AutoGen-ed  January 15, 2022 at 10:53:57 PM by AutoGen 5.18.16
+ * It has been AutoGen-ed  January 15, 2022 at 10:54:24 PM by AutoGen 5.18.16
  * From the definitions    inclhack.def
  * and the template file   fixincl
  */
-/* DO NOT SVN-MERGE THIS FILE, EITHER Sat Jan 15 22:53:57 UTC 2022
+/* DO NOT SVN-MERGE THIS FILE, EITHER Sat Jan 15 22:54:24 UTC 2022
  *
  * You must regenerate it.  Use the ./genfixes script.
  *
@@ -15,7 +15,7 @@
  * certain ANSI-incompatible system header files which are fixed to work
  * correctly with ANSI C and placed in a directory that GNU C will search.
  *
- * This file contains 265 fixup descriptions.
+ * This file contains 266 fixup descriptions.
  *
  * See README for more information.
  *
@@ -10469,6 +10469,53 @@ static const char* apzVxworks_RegsPatch[] = {
     "#include <arch/../regs.h>",
     (char*)NULL };
 
+/* * * * * * * * * * * * * * * * * * * * * * * * * *
+ *
+ *  Description of Vxworks_Posix_Open fix
+ */
+tSCC zVxworks_Posix_OpenName[] =
+     "vxworks_posix_open";
+
+/*
+ *  File name selection pattern
+ */
+tSCC zVxworks_Posix_OpenList[] =
+  "fcntl.h\0";
+/*
+ *  Machine/OS name selection pattern
+ */
+tSCC* apzVxworks_Posix_OpenMachs[] = {
+        "*-*-vxworks*",
+        (const char*)NULL };
+
+/*
+ *  content selection pattern - do fix if pattern found
+ */
+tSCC zVxworks_Posix_OpenSelect0[] =
+       "extern int.*open \\(const char \\*[ a-z]*, int[ a-z]*, int[ a-z]*\\);";
+
+#define    VXWORKS_POSIX_OPEN_TEST_CT  1
+static tTestDesc aVxworks_Posix_OpenTests[] = {
+  { TT_EGREP,    zVxworks_Posix_OpenSelect0, (regex_t*)NULL }, };
+
+/*
+ *  Fix Command Arguments for Vxworks_Posix_Open
+ */
+static const char* apzVxworks_Posix_OpenPatch[] = {
+    "format",
+    "%0\n\n\
+#if defined(__cplusplus)\n\
+extern \"C++\" {\n\
+  inline int open (const char *, int) __attribute__((__always_inline__));\n\n\
+  inline int\n\
+  open (const char *name, int flags)\n\
+  {\n\
+    return open (name, flags, 0);\n\
+  }\n\
+}\n\
+#endif\n",
+    (char*)NULL };
+
 /* * * * * * * * * * * * * * * * * * * * * * * * * *
  *
  *  Description of Vxworks_Time fix
@@ -10795,9 +10842,9 @@ static const char* apzX11_SprintfPatch[] = {
  *
  *  List of all fixes
  */
-#define REGEX_COUNT          304
+#define REGEX_COUNT          305
 #define MACH_LIST_SIZE_LIMIT 187
-#define FIX_COUNT            265
+#define FIX_COUNT            266
 
 /*
  *  Enumerate the fixes
@@ -11060,6 +11107,7 @@ typedef enum {
     VXWORKS_NEEDS_VXWORKS_FIXIDX,
     VXWORKS_NEXT_YVALS_FIXIDX,
     VXWORKS_REGS_FIXIDX,
+    VXWORKS_POSIX_OPEN_FIXIDX,
     VXWORKS_TIME_FIXIDX,
     VXWORKS_WRITE_CONST_FIXIDX,
     VXWORKS_IOLIB_INCLUDE_UNISTD_FIXIDX,
@@ -12356,6 +12404,11 @@ tFixDesc fixDescList[ FIX_COUNT ] = {
      VXWORKS_REGS_TEST_CT, FD_MACH_ONLY | FD_SUBROUTINE,
      aVxworks_RegsTests,   apzVxworks_RegsPatch, 0 },
 
+  {  zVxworks_Posix_OpenName,    zVxworks_Posix_OpenList,
+     apzVxworks_Posix_OpenMachs,
+     VXWORKS_POSIX_OPEN_TEST_CT, FD_MACH_ONLY | FD_SUBROUTINE,
+     aVxworks_Posix_OpenTests,   apzVxworks_Posix_OpenPatch, 0 },
+
   {  zVxworks_TimeName,    zVxworks_TimeList,
      apzVxworks_TimeMachs,
      VXWORKS_TIME_TEST_CT, FD_MACH_ONLY | FD_SUBROUTINE,

fixincludes/inclhack.def

@@ -5296,6 +5296,47 @@ fix = {
     test_text   = "#include <regs.h>\n";
 };
 
+/*
+ * Likewise, open's posix interface allows two or three arguments and
+ * some VxWorks headers expose only a strict 3 arguments version.  Merely
+ * changing the prototype into a varargs one is risky as the implementation
+ * would receive garbage in the third arg for calls providing only two,
+ * which libstdc++ does.  We simply provide an always inline overload for C++
+ * instead.
+ *
+ * Both fcntl.h and ioLib.h might "feature" such a prototype for _WRS_KERNEL.
+ * The latter #includes the former though (since 1992 according to the embedded
+ * log), so just leave ioLib.h alone.
+ */
+fix = {
+    hackname    = vxworks_posix_open;
+    mach        = "*-*-vxworks*";
+    files       = fcntl.h;
+
+    select      = "extern int.*open \\(const char \\*[ a-z]*, int[ a-z]*, int[ a-z]*\\);";
+    c_fix       = format;
+    c_fix_arg = << _EOArg_
+%0
+
+#if defined(__cplusplus)
+extern "C++" {
+  inline int open (const char *, int) __attribute__((__always_inline__));
+
+  inline int
+  open (const char *name, int flags)
+  {
+    return open (name, flags, 0);
+  }
+}
+#endif
+
+_EOArg_;
+
+    test_text   =
+      "extern int open (const char *, int, int);\n"
+      "extern int open (const char *name, int flags, int mode );\n";
+};
+
 /*
  *  Another bad dependency in VxWorks 5.2 <time.h>.
  */

fixincludes/tests/base/fcntl.h

@@ -18,6 +18,39 @@ extern "C" {
 #if defined( AAB_AIX_FCNTL_CHECK )
 
 #endif  /* AAB_AIX_FCNTL_CHECK */
+
+
+#if defined( VXWORKS_POSIX_OPEN_CHECK )
+extern int open (const char *, int, int);
+
+#if defined(__cplusplus)
+extern "C++" {
+  inline int open (const char *, int) __attribute__((__always_inline__));
+
+  inline int
+  open (const char *name, int flags)
+  {
+    return open (name, flags, 0);
+  }
+}
+#endif
+
+extern int open (const char *name, int flags, int mode );
+
+#if defined(__cplusplus)
+extern "C++" {
+  inline int open (const char *, int) __attribute__((__always_inline__));
+
+  inline int
+  open (const char *name, int flags)
+  {
+    return open (name, flags, 0);
+  }
+}
+#endif
+
+
+#endif  /* VXWORKS_POSIX_OPEN_CHECK */
 #ifdef __cplusplus
 }
 #endif